An ERA40-based atmospheric forcing for global ocean circulation models
International audience We develop, calibrate and test a dataset intended to drive global ocean hindcasts simulations of the last five decades. This dataset provides surface meteorological variables needed to estimate air-sea fluxes and is built from 6-hourly surface atmospheric state variables of ER...
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Online Access: | https://hal.science/hal-00496003 https://doi.org/10.1016/j.ocemod.2009.10.005 |
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ftunivnantes:oai:HAL:hal-00496003v1 2023-05-15T15:12:26+02:00 An ERA40-based atmospheric forcing for global ocean circulation models Brodeau, Laurent Barnier, Bernard Tréguier, Anne-Marie Penduff, Thierry Gulev, Sergei K. Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Department of Oceanography Florida State University Tallahassee (FSU) Shirshov Institut of Oceanography Russian Academy of Sciences Moscow (RAS) 2010 https://hal.science/hal-00496003 https://doi.org/10.1016/j.ocemod.2009.10.005 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ocemod.2009.10.005 hal-00496003 https://hal.science/hal-00496003 doi:10.1016/j.ocemod.2009.10.005 ISSN: 1463-5003 Ocean Modelling https://hal.science/hal-00496003 Ocean Modelling, 2010, 31 (3-4), pp.88-104. ⟨10.1016/j.ocemod.2009.10.005⟩ Ocean Hindcast Atmospheric forcing Air-sea fluxes Weather reanalyzes Satellite [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2010 ftunivnantes https://doi.org/10.1016/j.ocemod.2009.10.005 2023-03-01T00:36:50Z International audience We develop, calibrate and test a dataset intended to drive global ocean hindcasts simulations of the last five decades. This dataset provides surface meteorological variables needed to estimate air-sea fluxes and is built from 6-hourly surface atmospheric state variables of ERA40. We first compare the raw fields of ERA40 to the CORE.v1 dataset of Large and Yeager (2004), used here as a reference, and discuss our choice to use daily radiative fluxes and monthly precipitation products extracted from satellite data rather than their ERA40 counterparts. Both datasets lead to excessively high global imbalances of heat and freshwater fluxes when tested with a prescribed climatological sea surface temperature. After identifying unrealistic time discontinuities (induced by changes in the nature of assimilated observations) and obvious global and regional biases in ERA40 fields (by comparison to high quality observations), we propose a set of corrections. Tropical surface air humidity is decreased from 1979 onward, representation of Arctic surface air temperature is improved using recent observations and the wind is globally increased. These corrections lead to a significant decrease of the excessive positive global imbalance of heat. Radiation and precipitation fields are then submitted to a small adjustment (in zonal mean) that yields a near-zero global imbalance of heat and freshwater. A set of 47-year-long simulations is carried out with the coarse-resolution (2° × 2°) version of the NEMO OGCM to assess the sensitivity of the model to the proposed corrections. Model results show that each of the proposed correction contributes to improve the representation of central features of the global ocean circulation. Article in Journal/Newspaper Arctic Université de Nantes: HAL-UNIV-NANTES Arctic Ocean Modelling 31 3-4 88 104 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Ocean Hindcast Atmospheric forcing Air-sea fluxes Weather reanalyzes Satellite [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
Ocean Hindcast Atmospheric forcing Air-sea fluxes Weather reanalyzes Satellite [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Brodeau, Laurent Barnier, Bernard Tréguier, Anne-Marie Penduff, Thierry Gulev, Sergei K. An ERA40-based atmospheric forcing for global ocean circulation models |
topic_facet |
Ocean Hindcast Atmospheric forcing Air-sea fluxes Weather reanalyzes Satellite [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience We develop, calibrate and test a dataset intended to drive global ocean hindcasts simulations of the last five decades. This dataset provides surface meteorological variables needed to estimate air-sea fluxes and is built from 6-hourly surface atmospheric state variables of ERA40. We first compare the raw fields of ERA40 to the CORE.v1 dataset of Large and Yeager (2004), used here as a reference, and discuss our choice to use daily radiative fluxes and monthly precipitation products extracted from satellite data rather than their ERA40 counterparts. Both datasets lead to excessively high global imbalances of heat and freshwater fluxes when tested with a prescribed climatological sea surface temperature. After identifying unrealistic time discontinuities (induced by changes in the nature of assimilated observations) and obvious global and regional biases in ERA40 fields (by comparison to high quality observations), we propose a set of corrections. Tropical surface air humidity is decreased from 1979 onward, representation of Arctic surface air temperature is improved using recent observations and the wind is globally increased. These corrections lead to a significant decrease of the excessive positive global imbalance of heat. Radiation and precipitation fields are then submitted to a small adjustment (in zonal mean) that yields a near-zero global imbalance of heat and freshwater. A set of 47-year-long simulations is carried out with the coarse-resolution (2° × 2°) version of the NEMO OGCM to assess the sensitivity of the model to the proposed corrections. Model results show that each of the proposed correction contributes to improve the representation of central features of the global ocean circulation. |
author2 |
Laboratoire des Écoulements Géophysiques et Industriels Grenoble (LEGI) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Department of Oceanography Florida State University Tallahassee (FSU) Shirshov Institut of Oceanography Russian Academy of Sciences Moscow (RAS) |
format |
Article in Journal/Newspaper |
author |
Brodeau, Laurent Barnier, Bernard Tréguier, Anne-Marie Penduff, Thierry Gulev, Sergei K. |
author_facet |
Brodeau, Laurent Barnier, Bernard Tréguier, Anne-Marie Penduff, Thierry Gulev, Sergei K. |
author_sort |
Brodeau, Laurent |
title |
An ERA40-based atmospheric forcing for global ocean circulation models |
title_short |
An ERA40-based atmospheric forcing for global ocean circulation models |
title_full |
An ERA40-based atmospheric forcing for global ocean circulation models |
title_fullStr |
An ERA40-based atmospheric forcing for global ocean circulation models |
title_full_unstemmed |
An ERA40-based atmospheric forcing for global ocean circulation models |
title_sort |
era40-based atmospheric forcing for global ocean circulation models |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.science/hal-00496003 https://doi.org/10.1016/j.ocemod.2009.10.005 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 1463-5003 Ocean Modelling https://hal.science/hal-00496003 Ocean Modelling, 2010, 31 (3-4), pp.88-104. ⟨10.1016/j.ocemod.2009.10.005⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ocemod.2009.10.005 hal-00496003 https://hal.science/hal-00496003 doi:10.1016/j.ocemod.2009.10.005 |
op_doi |
https://doi.org/10.1016/j.ocemod.2009.10.005 |
container_title |
Ocean Modelling |
container_volume |
31 |
container_issue |
3-4 |
container_start_page |
88 |
op_container_end_page |
104 |
_version_ |
1766343105956544512 |